Bob strolled in to the party and overheard someone say how crackly the rims looked on his car.

crackly: The sound that ice cubes make when a beverage is poured over them. The sound multiple firecrackers make once ignited. The sound a baseball and bat makes when a baseball is well hit by the bat. The sound of a fierce slapshot in a hockey game. The sound a top fuel dragster engine makes when idling, et al.